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/*
* Based on node-yencode library by Anime Tosho:
* https://github.com/animetosho/node-yencode
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// inspired off https://github.com/jocover/crc32_armv8/blob/master/crc32_armv8.c
#include "nzbget.h"
#include "YEncode.h"
#ifdef __ARM_FEATURE_CRC32
#include <arm_acle.h>
#endif
namespace YEncode
{
#ifdef __ARM_FEATURE_CRC32
void crc_arm_init(crc_state *const s)
{
s->crc0[0] = ~0;
}
void crc_arm(crc_state *const s, const unsigned char *src, long len) {
uint32_t crc = s->crc0[0];
// initial alignment
if (len >= 16) { // 16 is an arbitrary number; it just needs to be >=8
if ((uintptr_t)src & sizeof(uint8_t)) {
crc = __crc32b(crc, *src);
src++;
len--;
}
if ((uintptr_t)src & sizeof(uint16_t)) {
crc = __crc32h(crc, *((uint16_t *)src));
src += sizeof(uint16_t);
len -= sizeof(uint16_t);
}
#ifdef __aarch64__
if ((uintptr_t)src & sizeof(uint32_t)) {
crc = __crc32w(crc, *((uint32_t *)src));
src += sizeof(uint32_t);
len -= sizeof(uint32_t);
}
}
while ((len -= sizeof(uint64_t)) >= 0) {
crc = __crc32d(crc, *((uint64_t *)src));
src += sizeof(uint64_t);
}
if (len & sizeof(uint32_t)) {
crc = __crc32w(crc, *((uint32_t *)src));
src += sizeof(uint32_t);
}
#else
}
while ((len -= sizeof(uint32_t)) >= 0) {
crc = __crc32w(crc, *((uint32_t *)src));
src += sizeof(uint32_t);
}
#endif
if (len & sizeof(uint16_t)) {
crc = __crc32h(crc, *((uint16_t *)src));
src += sizeof(uint16_t);
}
if (len & sizeof(uint8_t))
crc = __crc32b(crc, *src);
s->crc0[0] = crc;
}
uint32_t crc_arm_finish(crc_state *const s)
{
return ~s->crc0[0];
}
#endif
void init_crc_acle()
{
#ifdef __ARM_FEATURE_CRC32
crc_init = &crc_arm_init;
crc_incr = &crc_arm;
crc_finish = &crc_arm_finish;
crc_simd = true;
#endif
}
}
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